Thanks for the feedback. Limiting the max amount of Savagery GMs can hold onto is probably a good idea. Kessler was by far the one I struggled with the most (though he does satisfy the Werewolf in London reference two-fold). Turns out werewolves are significantly more rigid a concept than vampires.
In terms of the rules, I fully intend this to be a supporting piece to Eat the Reich, something you would only look into if you've already read and potentially already run Eat the Reich before, so reexplaining concepts in a book people will already own felt unnecessary.